Introducing Harness-1, a 20B search agent trained with a state-externalizing harness. > frontier-level long-horizon search, rivaling Opus-4.6 and outperforming GPT-5.4 > Context-1-level cost and latency > externalizes candidates, evidence, verification, and search history > …
Ranked by when the bookmark was saved during this London date range. Saves means the post's public bookmark count on X, not saves on this site. Metrics are X's latest public counts; older items can be stale once they leave the recent-bookmarks sync window.